RT9193T
300mA, Thermal Folded Back CMOS LDO Regulator
General Description
The RT9193T is designed for portable RF and wireless
applications with demanding performance and space
requirements. The RT9193T performance is optimized for
battery-powered systems to deliver ultra low noise and
low quiescent current. A noise bypass pin is available for
further reduction of output noise. Regulator ground current
increases only slightly in dropout, further prolonging the
battery life. The RT9193T also works with low-ESR
ceramic capacitors, reducing the amount of board space
necessary for power applications, critical in hand-held
wireless devices. The RT9193T consumes less than 0.01μA
in shutdown mode and has fast turn-on time less than
50μs. RT9193T is short circuit thermal folded back
protected. RT9193T lowers its OTP trip point from 165°C
to 110°C when output short circuit occurs (V
OUT
< 0.4V)
providing maximum safety to end users. The other features
include ultra low dropout voltage, high output accuracy,
current limiting protection, and high ripple rejection ratio.
Available in the 5-lead of SC-70, SOT-23 and
WDFN-6L 2x2 packages.
Ordering Information
RT9193T-
Package Type
U5 : SC-70-5
B : SOT-23-5
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Features
zz
Short Circuit Thermal Folded Back Protection
z
zz
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z Ultra-Low-Noise for RF Application
zz
zz
z Ultra-Fast Re spon se in Line/Loa d T ra n sient
zz
zz
z Quick Start-Up (T ypically 50us)
zz
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z < 0.01uA Standby Current When Shutdown
zz
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z Low Dropout : 220mV @ 300mA
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z Wide Operating Voltage Ranges : 2.5V to 5.5V
zz
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z TTL-Logic-Controlled Shutdown Input
zz
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z Low Temperature Coefficient
zz
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z Current Limiting Protection
zz
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z Thermal Shutdown Protection
zz
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z Only 1uF Output Capa citor Required f or Sta bility
zz
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z High Power Supply Rejection Ratio
zz
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z Custom Voltage Available
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z RoHS Compliant and 100% Lead (Pb)-Free
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Applications
z CDMA/GSM Cellular Handsets
z Battery-Powered Equipment
z Laptop, Palmtops, Notebook Computers
z Hand-Held Instruments
z PCMCIA Cards
z Portable Information Appliances
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Output Voltage
15 : 1.5V
16 : 1.6V
:
34 : 3.4V
35 : 3.5V
1H : 1.85V
2H : 2.85V
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
1
EN
2
GND
3
WDFN-6L 2x2
VOUT BP
5
VIN GND EN
6
BP
5
NC
7
4
VOUTVIN
4
23
SC-70-5/SOT-23-5
DS9193T-06 April 2011 www.richtek.com
1
RT9193T
Typical Application Circuit
V
IN
Chip Enable
Functional Pin Description
Pin Name
VIN
GND
EN
BP
VOUT
Pin Function
Power Input Voltage
Ground
Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100kΩ
resistor connected to GND when the control signal is floating.
Reference Noise Bypass
Output Voltage
C
1uF
+
IN
RT9193T
VIN
GND
EN BP
VOUT
+
C
OUT
1uF
C
BP
22nF
V
OUT
Function Block Diagram
EN
Quick
Start
BP
V
REF
Shutdown
and
Logic Control
+
-
Error
Amplifier
VIN
MOSFET
Driver
VOUT
Current-Limit
and
Thermal
Protection
GND
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2
RT9193T
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage ---------------------------------------------------------------------------------------------------- 6V
z Power Dissipation, P
SC-70-5 -------------------------------------------------------------------------------------------------------------------- 300mW
SOT-23-5------------------------------------------------------------------------------------------------------------------- 400mW
WDFN-6L 2x2 ------------------------------------------------------------------------------------------------------------- 606mW
z Package Thermal Resistance (Note 2)
SOT-70-5, θJA------------------------------------------------------------------------------------------------------------- 333°C/W
SOT-23-5, θJA------------------------------------------------------------------------------------------------------------- 250°C/W
WDFN-6L 2x2, θJA------------------------------------------------------------------------------------------------------- 165°C/W
z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C
z Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage ---------------------------------------------------------------------------------------------------- 2.5V to 5.5V
z Ambient Temperature Range ------------------------------------------------------------------------------------------
z Junction Temperature Range ------------------------------------------------------------------------------------------
@ T
D
= 25°C
A
−40°C to 85°C
−40°C to 125°C
Electrical Characteristics
(VIN = V
+ 1V, CIN = C
OUT
= 1uF, CBP = 22nF, T
OUT
Parameter Symbol Test Conditions Min Typ Max Unit
Output Voltage Accuracy ΔV
Current Limit I
Quiescent Current IQ V
Dropout Voltage (Note 5) V
Line Regulation ΔV
Load Regulation ΔV
Standby Current I
EN Input Bias Current I
Logic-Low Voltage
EN Threshold
Logic-High Voltage
Output Noise Voltage eNO
f = 100Hz -- −70 -- Power Supply
Rejection Rate
f = 10kHz
Thermal Shutdown Temperature TSD -- 165 -- °C
= 25°C, unless otherwise specified)
A
I
OUT
R
LIM
DROP
LINE
LOAD
VEN = GND, Shutdown -- 0.01 1 uA
STBY
VEN = GND or VIN -- 0 100 nA
IBSD
V
V
IL
V
VIN = 3V to 5.5V, Start-Up 1.2 -- --
IH
PSRR C
= 1mA −2 -- +2 %
OU T
= 1Ω 360 400 -- mA
LOAD
≥
1.2V, I
EN
I
= 200mA 170 200
OU T
I
= 300mA -- 220 300
OU T
V
= (V
IN
OUT
I
= 1mA
OU T
1mA < I
OUT
= 3V to 5.5V, Shutdown -- -- 0.4
IN
10Hz to 100kHz, I
= 1uF
C
OUT
= 1uF, I
OUT
= 0mA -- 90 130 μA
OUT
+ 0.3V) to 5.5V,
-- -- 0.3 %
< 300mA -- -- 0.6 %
= 200mA
OUT
OUT
= 10mA
-- 100 -- uV
-- −50 --
mV
V
RMS
dB
DS9193T-06 April 2011 www.richtek.com
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RT9193T
y
Parameter Symbol Test Conditions Min Typ Max Unit
Thermal Shutdown Temperature
H
steresis
ΔT
-- 30 -- °C
SD
Thermal Folded Back -- 110 -- °C
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θ
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. The dropout voltage is defined as V
is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board
JA
(Single Layer, 1S) of JEDEC 51-3 thermal measurement standard.
-V
IN
, which is measured when V
OUT
OUT
is V
OUT(NORMAL)
− 100mV.
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Typical Operating Characteristics
RT9193T
Output Voltage vs. Temperature
1.8
RT9193T-15PU5
V
= 3.3V
IN
1.7
1.6
1.5
1.4
CIN = C
= 1uF X7R
OUT
Output Voltage (V)
1.3
1.2
-50-25 0 25 50 75100125
Tempe rature
(°C)
Dropout Voltage v s . Load Current
300
RT9193T-33PB
CIN = C
250
200
150
100
Dropout Voltage (mV)
50
OUT
= 1uF
T
J
= 25°C
T
= 125°C
J
T
= -40°C
J
Quiescent Current vs. Temperature
95
RT9193T-15PU5
V
= 3.3V
IN
90
CIN = C
85
80
75
70
Quiescent Current (uA)
65
60
-50-250 255075100125
= 1uF X7R
OUT
Temperature
(°C)
PSRR
20
V
= 4V to 5V
IN
PSRR (dB)
CIN = C
0
-20
-40
-60
= 1uF, X7R
OUT
I
LOAD
= 100mA
I
LOAD
= 10mA
0
0 0.0 5 0.1 0.15 0.2 0.25 0.3
Load Current (A)
EN Pin Shoutdown Threshold vs. Temperature
1.75
RT9193T-15PU5
V
= 3.3V
IN
CIN = C
1.5
1.25
1
0.75
EN Pin Shoutdown Threshold (V)
0.5
-50 -25 0 25 50 75 100 125
= 1uF X7R
OUT
Temperature
(°C)
-80
10 100 1K 10K 100K 1M
0.01 0.1 1 10 100 1000
Frequency (kHz)
(Hz)
EN Pin Shutdown Response
V
10
5
(V)
0
EN Pin Voltage
(V)
Output Voltage
2
1
0
= 5V
IN
CIN = C
OUT
= 1uF
Time (500μs/Div)
RT9193T-28PU5
No Load
DS9193T-06 April 2011 www.richtek.com
5
RT9193T
V
CIN = C
100
50
(mA)
0
Load Current
20
0
-20
Output Voltage
Deviation (mV)
V
IN
C
OUT
6
5
4
Deviation (V)
Input Voltage
Load Transient Response
= 5V, V
IN
= 2.8V
OUT
= 1uF
OUT
Time (500μs/Div)
I
Line Transient Response
= 4V to 5V
= 1uF
= 1mA to 60mA
LOAD
RT9193T-25PB
I
LOAD
= 1mA
400
200
(mA)
0
Load Current
50
0
-50
Output Voltage
Deviation (mV)
V
C
6
5
Deviation (V)
Input Voltage
4
Load Transient Response
V
= 5V, V
IN
CIN = C
OUT
OUT
= 1uF
= 2.8V
Time (500μs/Div)
Line Transient Response
= 4V to 5V
IN
= 1uF
OUT
I
= 1mA to 250mA
LOAD
RT9193T-25PB
I
LOAD
= 100mA
10
0
-10
Output Voltage
Deviation (mV)
V
IN
CIN = C
200
100
0
-100
Noise (μV)
-200
= 4.5V
OUT
Time (50μs/Div)
= 1uF, X7R
Time (10ms/Div)
Noise
RT9193T-30PB
I
= 50mA
LOAD
f = 10Hz to 100kHz
10
0
-10
Output Voltage
Deviation (mV)
V
CIN = C
200
100
0
-100
Noise (μV)
-200
IN
= 4.5V
OUT
Time (100μs/Div)
Noise
= 1uF, X7R
Time (10ms/Div)
RT9193T-15PU5
I
= 50mA
LOAD
f = 10Hz to 100kHz
DS9193T-06 April 2011www.richtek.com
6
10
5
(V)
0
EN Pin Voltage
2
1
(V)
0
Output Voltage
V
= 5V
IN
CIN = C
OUT
Start Up
= 1uF
Time (10μs/Div)
RT9193T
RT9193T-28PU5
No Load
DS9193T-06 April 2011 www.richtek.com
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RT9193T
Applications Information
Like any low-dropout regulator, the external capacitors used
with the RT9193T must be carefully selected for regulator
stability and performance. Using a capacitor whose value
is > 1μF on the RT9193T input and the amount of
capacitance can be increased without limit. The input
capacitor must be located a distance of not more than
0.5 inch from the input pin of the IC and returned to a
clean analog ground. Any good quality ceramic or
tantalum can be used for this capacitor. The capacitor
with larger value and lower ESR (equivalent series
resistance) provides better PSRR and line-transient
response. The output capacitor must meet both
requirements for minimum amount of capacitance and
ESR in all LDOs application. The RT9193T is designed
specifically to work with low ESR ceramic output capacitor
in space-saving and performance consideration. Using
a ceramic capacitor whose value is at least 1μF with ESR
is > 25mΩ on the RT9193T output ensures stability. The
RT9193T still works well with output capacitor of other
types due to the wide stable ESR range. Figure 1 shows
the curves of allowable ESR range as a function of load
current for various output capacitor values. Output
capacitor of larger capacitance can reduce noise and
improve load transient response, stability, and PSRR. The
output capacitor should be located not more than 0.5
inch from the V
pin of the RT9193T and returned to a
OUT
clean analog ground.
Bypass Ca pa citor and Low Noise
Connecting a 22nF between the BP pin and GND pin
significantly reduces noise on the regulator output, it is
critical that the capacitor connection between the BP pin
and GND pin be direct and PCB traces should be as short
as possible. There is a relationship between the bypass
capacitor value and the LDO regulator turn on time. DC
leakage on this pin can affect the LDO regulator output
noise and voltage regulation performance.
Enable Function
The RT9193T features an LDO regulator enable/disable
function. To assure the LDO regulator will switch on, the
EN turn on control level must be greater than 1.2 volts.
The LDO regulator will go into the shutdown mode when
the voltage on the EN pin falls below 0.4 volts. For to
protecting the system, the RT9193T have a quick-
discharge function. If the enable function is not needed in
a specific application, it may be tied to VIN to keep the
LDO regulator in a continuously on state.
Thermal Considerations
Thermal protection limits power dissipation in RT9193T.
When the operation junction temperature exceeds 165°C,
the OTP circuit starts the thermal shutdown function turn
the pass element off. The pass element turn on again
after the junction temperature cools by 30°C.
Region of Stable C
100.00
100
10
10.00
1
1.00
ESR (Ω)
0.10
OUT
C
0.01
0.00
0 50 100 150 200 250 300
8
OUT
Instable
Stable
Simulation Verify
Load Current (mA)
Figure 1
ESR vs. Load Current
RT9193T-15PU5
CIN = C
= 1uF, X7R
OUT
RT9193T lowers its OTP trip level from 165°C to 110°C
when output short circuit occurs (V
< 0.4V) as shown
OUT
in Figure 2. This limits IC case temperature under 100°C
and provides maximum safety to end users when output
short circuit occurs.
For continue operation, do not exceed absolute maximum
operation junction temperature 125°C. The power
dissipation definition in device is :
PD = (VIN−V
OUT
) x I
OUT
+ VIN x I
Q
The maximum power dissipation depends on the thermal
resistance of IC package, PCB layout, the rate of
surroundings airflow and temperature difference between
junction to ambient. The maximum power dissipation can
be calculated by following formula :
DS9193T-06 April 2011www.richtek.com
RT9193T
P
Where T
D(MAX)
= ( T
J(MAX)
− TA ) /θ
J(MAX)
JA
is the maximum operation junction
temperature 125°C, TA is the ambient temperature and
the θ
is the junction to ambient thermal resistance.
JA
For recommended operating conditions specification of
RT9193T, where T
is the maximum junction
J(MAX)
temperature of the die (125°C) and TA is the maximum
ambient temperature. The junction to ambient thermal
resistance (θJA is layout dependent) for SOT-23-5 package
is 250°C/W, SC-70-5 package is 333°C/W and
WDFN-6L 2x2 package is 165°C/W on standard JEDEC
51-3 thermal test board. The maximum power dissipation
at TA = 25°C can be calculated by following formula :
P
P
P
= (125°C−25°C) / 333 = 300mW (SC-70-5)
D(MAX)
= (125°C−25°C) / 250 = 400mW (SOT-23-5)
D(MAX)
= (125°C−25°C) / 165 = 606mW (WDFN-6L 2x2)
D(MAX)
The maximum power dissipation depends on operating
ambient temperature for fixed T
and thermal
J(MAX)
resistance θJA. For RT9193T packages, the Figure 3 of
derating curves allows the designer to see the effect of
rising ambient temperature on the maximum power
allowed.
700
WDFN-6L 2x2
600
500
SOT-23-5
400
SC 70-5
300
200
Power Dissipation (mW)
100
0
0 255075100125150
Ambient Temperature (°C)
Figure 3. Derating Curve for Packages
V
Short to GND
OUT
0.4V
V
OUT
I
OUT
TSD
165 C
°
110 C
OTP Trip Point
IC Temperature
°
110 C
80 C
°
°
Figure 2. Short Circuit Thermal Folded Back Protection
when Output Short Circuit Occurs
DS9193T-06 April 2011 www.richtek.com
9
RT9193T
Outline Dimension
H
D
L
C
b
A
e
Dimensions In Millimeters Dimension s In Inches
Symbol
Min Max Min Max
A 0.800 1.100 0.031 0.044
A1 0.000 0.100 0.000 0.004
B 1.150 1.350 0.045 0.054
b 0.150 0.400 0.006 0.016
C 1.800 2.450 0.071 0.096
D 1.800 2.250 0.071 0.089
B
A1
10
e 0.650 0.026
H 0.080 0.260 0.003 0.010
L 0.210 0.460 0.008 0.018
SC-70-5 Surface Mount Package
DS9193T-06 April 2011www.richtek.com
RT9193T
H
D
L
C
b
A
e
Dimensio ns In Millim eters Dimensions In Inches
Symbol
Min Max Min Max
A 0.889 1.295 0.035 0.051
A1 0.000 0.152 0.000 0.006
B 1.397 1.803 0.055 0.071
b 0.356 0.559 0.014 0.022
C 2.591 2.997 0.102 0.118
D 2.692 3.099 0.106 0.122
B
A1
e 0.838 1.041 0.033 0.041
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024
SOT-23-5 Surf ace Mount Package
DS9193T-06 April 2011 www.richtek.com
11
RT9193T
D
E
A
A3
A1
D2
L
E2
SEE DETAIL A
1
e
b
2
1
1
2
DET AIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Dimensions In Millimeters Dimensions In Inches
Symbol
Min Max Min Max
A 0.700 0.800 0.028 0.031
A1 0.000 0.050 0.000 0.002
A3 0.175 0.250
b 0.200 0.350 0.008 0.014
D 1.950 2.050 0.077 0.081
D2 1.000 1.450 0.039 0.057
E 1.950 2.050 0.077 0.081
E2 0.500 0.850 0.020 0.033
e 0.650 0.026
L 0.300 0.400
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
0.007 0.010
0.012 0.016
W-Type 6L DFN 2x2 Package
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: marketing@richtek.com
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
DS9193T-06 April 2011www.richtek.com
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